本题目来源于试卷: Topic A1.1 Water，类别为 IB生物学
[问答题]
9. Outline two reasons why co87jqqq r8ay+hsd(cas2 fn 64 go-y. m n-e54worsj(aj:7ibvy 2 rl(wunditions on the Earth retain water on its surface
参考答案: Water (Liquid and gaseous) is retained on Earth by the Earth’s gravity. / Earth has enough gravity for an atmosphere to be held around the Earth. The temperature of the Earth’s atmosphere is in the right range for vapour to condense into liquid water (less than 100°C)
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